#include<iostream>
#include<algorithm>
using namespace std;
const int N = 1e3 + 10;
int main()
{
	int n;
	int arr[N];
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> arr[i];
	}
	sort(arr, arr + n);
	cout << arr[n - 1] - arr[0] << endl;
	return  0;
}